I have an idea for a packer/cultipacker(not sure which it would be), so here it is. Take some small tires like these

And put them on an axle, all side by side (maybe about 1/2" spacer between each?) and put a hitch on. (This probably isn't an original idea)
The hitch would need a place to set a cinder block or two for some weight.

Think that would be a good project? Or waste of time?

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I don't think you could get enough weight to do you much good. All those wheels would increase the bearing surface so there would be little pounds per square inch. I had a job in the factory where I dip painted 1000 40 lb cast cultipacker wheels per day.

Lifting them off a rack hanging them on the dip paint line and then restacking them amounted to 80,000 pounds lifted per day.